Anyone who is anyone is or wants to be in this movie! We're telling you right now, its going to be HUGE!

Sources are reporting a slew of new celebrity guest stars who are rumored to be appearing in Jason Segal's rebirth of Muppet-mania.

So far, the new list includes such Hollywood heavyweights Ricky Gervais, Alan Arkin, Billy Crystal, Zach Galifianakis and Jean-Claude Van Damme. On the music end of things, Foo Fighters frontman Dave Grohl is said to taking over for Animal at the drums for Electric Mayhem, when the latter is sent to anger management class.

On top of that, Flight of the Conchords star Bret McKenzie announced to sources that he'll be acting as the music supervisor on the flick, having already gone into the studio to record a Kermit and Miss Piggy duet!

Rad! Rad! Rad!

There are really some phenomenal people bringing this movie together. We really have super high expectations for it.